Re: [PATCH v2 1/6] drm/i915: Add a new "remapped" gtt_view

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On Mon, Jan 14, 2019 at 09:55:10AM +0000, Tvrtko Ursulin wrote:
> 
> On 11/01/2019 19:46, Ville Syrjala wrote:
> > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > 
> > To overcome display engine stride limits we'll want to remap the
> > pages in the GTT. To that end we need a new gtt_view type which
> > is just like the "rotated" type except not rotated.
> 
> I think I asked this before, so sorry if you also answered it - what 
> about rotated setups which go over display engine stride limits?

We already have the code to do the rotated mapping.

> 
> > v2: Use intel_remapped_plane_info base type
> >      s/unused/unused_mbz/ (Chris)
> >      Separate BUILD_BUG_ON()s (Chris)
> >      Use I915_GTT_PAGE_SIZE (Chris)
> > v3: Use i915_gem_object_get_dma_address() (Chris)
> >      Trim the sg (Tvrtko)
> > v4: Actually trim this time. Limit the max length
> >      to one row of pages to keep things simple
> > 
> > Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> > Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx>
> > Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > ---
> >   drivers/gpu/drm/i915/i915_debugfs.c       | 12 ++++
> >   drivers/gpu/drm/i915/i915_drv.h           |  4 ++
> >   drivers/gpu/drm/i915/i915_gem.c           | 17 ++++-
> >   drivers/gpu/drm/i915/i915_gem_gtt.c       | 88 +++++++++++++++++++++++
> >   drivers/gpu/drm/i915/i915_gem_gtt.h       | 25 +++++--
> >   drivers/gpu/drm/i915/i915_vma.c           |  6 +-
> >   drivers/gpu/drm/i915/i915_vma.h           |  3 +
> >   drivers/gpu/drm/i915/intel_display.c      | 11 +++
> >   drivers/gpu/drm/i915/intel_drv.h          |  1 +
> >   drivers/gpu/drm/i915/selftests/i915_vma.c |  6 +-
> >   10 files changed, 163 insertions(+), 10 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> > index d460ef522d9c..cab7771799ad 100644
> > --- a/drivers/gpu/drm/i915/i915_debugfs.c
> > +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> > @@ -196,6 +196,18 @@ describe_obj(struct seq_file *m, struct drm_i915_gem_object *obj)
> >   					   vma->ggtt_view.rotated.plane[1].offset);
> >   				break;
> >   
> > +			case I915_GGTT_VIEW_REMAPPED:
> > +				seq_printf(m, ", remapped [(%ux%u, stride=%u, offset=%u), (%ux%u, stride=%u, offset=%u)]",
> > +					   vma->ggtt_view.remapped.plane[0].width,
> > +					   vma->ggtt_view.remapped.plane[0].height,
> > +					   vma->ggtt_view.remapped.plane[0].stride,
> > +					   vma->ggtt_view.remapped.plane[0].offset,
> > +					   vma->ggtt_view.remapped.plane[1].width,
> > +					   vma->ggtt_view.remapped.plane[1].height,
> > +					   vma->ggtt_view.remapped.plane[1].stride,
> > +					   vma->ggtt_view.remapped.plane[1].offset);
> > +				break;
> > +
> >   			default:
> >   				MISSING_CASE(vma->ggtt_view.type);
> >   				break;
> > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> > index 5df26ccda8a4..cef76cf343c4 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.h
> > +++ b/drivers/gpu/drm/i915/i915_drv.h
> > @@ -2845,6 +2845,10 @@ i915_gem_object_get_dirty_page(struct drm_i915_gem_object *obj,
> >   			       unsigned int n);
> >   
> >   dma_addr_t
> > +i915_gem_object_get_dma_address_len(struct drm_i915_gem_object *obj,
> > +				    unsigned long n,
> > +				    unsigned int *len);
> > +dma_addr_t
> >   i915_gem_object_get_dma_address(struct drm_i915_gem_object *obj,
> >   				unsigned long n);
> >   
> > diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> > index ea85da393662..f65d81f4f3d7 100644
> > --- a/drivers/gpu/drm/i915/i915_gem.c
> > +++ b/drivers/gpu/drm/i915/i915_gem.c
> > @@ -6041,16 +6041,29 @@ i915_gem_object_get_dirty_page(struct drm_i915_gem_object *obj,
> >   }
> >   
> >   dma_addr_t
> > -i915_gem_object_get_dma_address(struct drm_i915_gem_object *obj,
> > -				unsigned long n)
> > +i915_gem_object_get_dma_address_len(struct drm_i915_gem_object *obj,
> > +				    unsigned long n,
> > +				    unsigned int *len)
> >   {
> >   	struct scatterlist *sg;
> >   	unsigned int offset;
> >   
> >   	sg = i915_gem_object_get_sg(obj, n, &offset);
> > +
> > +	if (len)
> > +		*len = sg_dma_len(sg) - (offset << PAGE_SHIFT);
> > +
> >   	return sg_dma_address(sg) + (offset << PAGE_SHIFT);
> >   }
> >   
> > +dma_addr_t
> > +i915_gem_object_get_dma_address(struct drm_i915_gem_object *obj,
> > +				unsigned long n)
> > +{
> > +	return i915_gem_object_get_dma_address_len(obj, n, NULL);
> > +}
> > +
> > +
> >   int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, int align)
> >   {
> >   	struct sg_table *pages;
> > diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> > index a8807fbed0aa..be5dbbb1b6ff 100644
> > --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> > +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> > @@ -3605,6 +3605,89 @@ intel_rotate_pages(struct intel_rotation_info *rot_info,
> >   	return ERR_PTR(ret);
> >   }
> >   
> > +static struct scatterlist *
> > +remap_pages(struct drm_i915_gem_object *obj, unsigned int offset,
> > +	    unsigned int width, unsigned int height,
> > +	    unsigned int stride,
> > +	    struct sg_table *st, struct scatterlist *sg)
> > +{
> > +	unsigned int row;
> > +
> > +	for (row = 0; row < height; row++) {
> > +		unsigned int left = width * I915_GTT_PAGE_SIZE;
> > +
> > +		while (left) {
> > +			dma_addr_t addr;
> > +			unsigned int length;
> > +
> > +			/* We don't need the pages, but need to initialize
> > +			 * the entries so the sg list can be happily traversed.
> > +			 * The only thing we need are DMA addresses.
> > +			 */
> > +
> > +			addr = i915_gem_object_get_dma_address_len(obj, offset, &length);
> > +
> > +			length = min(left, length);
> > +
> > +			st->nents++;
> > +
> > +			sg_set_page(sg, NULL, length, 0);
> > +			sg_dma_address(sg) = addr;
> > +			sg_dma_len(sg) = length;
> > +			sg = sg_next(sg);
> > +
> > +			offset += length / I915_GTT_PAGE_SIZE;
> > +			left -= length;
> > +		}
> > +
> > +		offset += stride - width;
> > +	}
> > +
> > +	return sg;
> > +}
> > +
> > +static noinline struct sg_table *
> > +intel_remap_pages(struct intel_remapped_info *rem_info,
> > +		  struct drm_i915_gem_object *obj)
> > +{
> > +	unsigned int size = intel_remapped_info_size(rem_info);
> > +	struct sg_table *st;
> > +	struct scatterlist *sg;
> > +	int ret = -ENOMEM;
> > +	int i;
> > +
> > +	/* Allocate target SG list. */
> > +	st = kmalloc(sizeof(*st), GFP_KERNEL);
> > +	if (!st)
> > +		goto err_st_alloc;
> > +
> > +	ret = sg_alloc_table(st, size, GFP_KERNEL);
> > +	if (ret)
> > +		goto err_sg_alloc;
> > +
> > +	st->nents = 0;
> > +	sg = st->sgl;
> > +
> > +	for (i = 0 ; i < ARRAY_SIZE(rem_info->plane); i++) {
> > +		sg = remap_pages(obj, rem_info->plane[i].offset,
> > +				 rem_info->plane[i].width, rem_info->plane[i].height,
> > +				 rem_info->plane[i].stride, st, sg);
> > +	}
> > +
> > +	i915_sg_trim(st);
> > +
> > +	return st;
> > +
> > +err_sg_alloc:
> > +	kfree(st);
> > +err_st_alloc:
> > +
> > +	DRM_DEBUG_DRIVER("Failed to create remapped mapping for object size %zu! (%ux%u tiles, %u pages)\n",
> > +			 obj->base.size, rem_info->plane[0].width, rem_info->plane[0].height, size);
> > +
> > +	return ERR_PTR(ret);
> > +}
> > +
> >   static noinline struct sg_table *
> >   intel_partial_pages(const struct i915_ggtt_view *view,
> >   		    struct drm_i915_gem_object *obj)
> > @@ -3683,6 +3766,11 @@ i915_get_ggtt_vma_pages(struct i915_vma *vma)
> >   			intel_rotate_pages(&vma->ggtt_view.rotated, vma->obj);
> >   		break;
> >   
> > +	case I915_GGTT_VIEW_REMAPPED:
> > +		vma->pages =
> > +			intel_remap_pages(&vma->ggtt_view.remapped, vma->obj);
> > +		break;
> > +
> >   	case I915_GGTT_VIEW_PARTIAL:
> >   		vma->pages = intel_partial_pages(&vma->ggtt_view, vma->obj);
> >   		break;
> > diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h
> > index e2360f16427a..8f26b4292084 100644
> > --- a/drivers/gpu/drm/i915/i915_gem_gtt.h
> > +++ b/drivers/gpu/drm/i915/i915_gem_gtt.h
> > @@ -162,11 +162,18 @@ typedef u64 gen8_ppgtt_pml4e_t;
> >   
> >   struct sg_table;
> >   
> > +struct intel_remapped_plane_info {
> > +	/* in gtt pages */
> > +	unsigned int width, height, stride, offset;
> > +} __packed;
> > +
> > +struct intel_remapped_info {
> > +	struct intel_remapped_plane_info plane[2];
> > +	unsigned int unused_mbz;
> > +} __packed;
> > +
> >   struct intel_rotation_info {
> > -	struct intel_rotation_plane_info {
> > -		/* tiles */
> > -		unsigned int width, height, stride, offset;
> > -	} plane[2];
> > +	struct intel_remapped_plane_info plane[2];
> >   } __packed;
> >   
> >   struct intel_partial_info {
> > @@ -178,12 +185,20 @@ enum i915_ggtt_view_type {
> >   	I915_GGTT_VIEW_NORMAL = 0,
> >   	I915_GGTT_VIEW_ROTATED = sizeof(struct intel_rotation_info),
> >   	I915_GGTT_VIEW_PARTIAL = sizeof(struct intel_partial_info),
> > +	I915_GGTT_VIEW_REMAPPED = sizeof(struct intel_remapped_info),
> >   };
> >   
> >   static inline void assert_i915_gem_gtt_types(void)
> >   {
> >   	BUILD_BUG_ON(sizeof(struct intel_rotation_info) != 8*sizeof(unsigned int));
> >   	BUILD_BUG_ON(sizeof(struct intel_partial_info) != sizeof(u64) + sizeof(unsigned int));
> > +	BUILD_BUG_ON(sizeof(struct intel_remapped_info) != 9*sizeof(unsigned int));
> > +
> > +	/* Check that rotation/remapped shares offsets for simplicity */
> > +	BUILD_BUG_ON(offsetof(struct intel_remapped_info, plane[0]) !=
> > +		     offsetof(struct intel_rotation_info, plane[0]));
> > +	BUILD_BUG_ON(offsetofend(struct intel_remapped_info, plane[1]) !=
> > +		     offsetofend(struct intel_rotation_info, plane[1]));
> >   
> >   	/* As we encode the size of each branch inside the union into its type,
> >   	 * we have to be careful that each branch has a unique size.
> > @@ -192,6 +207,7 @@ static inline void assert_i915_gem_gtt_types(void)
> >   	case I915_GGTT_VIEW_NORMAL:
> >   	case I915_GGTT_VIEW_PARTIAL:
> >   	case I915_GGTT_VIEW_ROTATED:
> > +	case I915_GGTT_VIEW_REMAPPED:
> >   		/* gcc complains if these are identical cases */
> >   		break;
> >   	}
> > @@ -203,6 +219,7 @@ struct i915_ggtt_view {
> >   		/* Members need to contain no holes/padding */
> >   		struct intel_partial_info partial;
> >   		struct intel_rotation_info rotated;
> > +		struct intel_remapped_info remapped;
> >   	};
> >   };
> >   
> > diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
> > index 5b4d78cdb4ca..9a039c36dc0c 100644
> > --- a/drivers/gpu/drm/i915/i915_vma.c
> > +++ b/drivers/gpu/drm/i915/i915_vma.c
> > @@ -164,6 +164,9 @@ vma_create(struct drm_i915_gem_object *obj,
> >   		} else if (view->type == I915_GGTT_VIEW_ROTATED) {
> >   			vma->size = intel_rotation_info_size(&view->rotated);
> >   			vma->size <<= PAGE_SHIFT;
> > +		} else if (view->type == I915_GGTT_VIEW_REMAPPED) {
> > +			vma->size = intel_remapped_info_size(&view->remapped);
> > +			vma->size <<= PAGE_SHIFT;
> >   		}
> >   	}
> >   
> > @@ -464,7 +467,8 @@ void __i915_vma_set_map_and_fenceable(struct i915_vma *vma)
> >   	 * Explicitly disable for rotated VMA since the display does not
> >   	 * need the fence and the VMA is not accessible to other users.
> >   	 */
> > -	if (vma->ggtt_view.type == I915_GGTT_VIEW_ROTATED)
> > +	if (vma->ggtt_view.type == I915_GGTT_VIEW_ROTATED ||
> > +	    vma->ggtt_view.type == I915_GGTT_VIEW_REMAPPED)
> >   		return;
> >   
> >   	fenceable = (vma->node.size >= vma->fence_size &&
> > diff --git a/drivers/gpu/drm/i915/i915_vma.h b/drivers/gpu/drm/i915/i915_vma.h
> > index 4f7c1c7599f4..64cf029c028a 100644
> > --- a/drivers/gpu/drm/i915/i915_vma.h
> > +++ b/drivers/gpu/drm/i915/i915_vma.h
> > @@ -265,8 +265,11 @@ i915_vma_compare(struct i915_vma *vma,
> >   	 */
> >   	BUILD_BUG_ON(I915_GGTT_VIEW_NORMAL >= I915_GGTT_VIEW_PARTIAL);
> >   	BUILD_BUG_ON(I915_GGTT_VIEW_PARTIAL >= I915_GGTT_VIEW_ROTATED);
> > +	BUILD_BUG_ON(I915_GGTT_VIEW_ROTATED >= I915_GGTT_VIEW_REMAPPED);
> >   	BUILD_BUG_ON(offsetof(typeof(*view), rotated) !=
> >   		     offsetof(typeof(*view), partial));
> > +	BUILD_BUG_ON(offsetof(typeof(*view), rotated) !=
> > +		     offsetof(typeof(*view), remapped));
> >   	return memcmp(&vma->ggtt_view.partial, &view->partial, view->type);
> >   }
> >   
> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > index 5dc0de89c49e..c17a1723a589 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -1942,6 +1942,17 @@ unsigned int intel_rotation_info_size(const struct intel_rotation_info *rot_info
> >   	return size;
> >   }
> >   
> > +unsigned int intel_remapped_info_size(const struct intel_remapped_info *rem_info)
> > +{
> > +	unsigned int size = 0;
> > +	int i;
> > +
> > +	for (i = 0 ; i < ARRAY_SIZE(rem_info->plane); i++)
> > +		size += rem_info->plane[i].width * rem_info->plane[i].height;
> > +
> > +	return size;
> > +}
> > +
> >   static void
> >   intel_fill_fb_ggtt_view(struct i915_ggtt_view *view,
> >   			const struct drm_framebuffer *fb,
> > diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> > index 3b051fdd0fce..7b9b76d5895e 100644
> > --- a/drivers/gpu/drm/i915/intel_drv.h
> > +++ b/drivers/gpu/drm/i915/intel_drv.h
> > @@ -1601,6 +1601,7 @@ unsigned int intel_fb_xy_to_linear(int x, int y,
> >   void intel_add_fb_offsets(int *x, int *y,
> >   			  const struct intel_plane_state *state, int plane);
> >   unsigned int intel_rotation_info_size(const struct intel_rotation_info *rot_info);
> > +unsigned int intel_remapped_info_size(const struct intel_remapped_info *rem_info);
> >   bool intel_has_pending_fb_unpin(struct drm_i915_private *dev_priv);
> >   void intel_mark_busy(struct drm_i915_private *dev_priv);
> >   void intel_mark_idle(struct drm_i915_private *dev_priv);
> > diff --git a/drivers/gpu/drm/i915/selftests/i915_vma.c b/drivers/gpu/drm/i915/selftests/i915_vma.c
> > index ffa74290e054..4fc49c27f13c 100644
> > --- a/drivers/gpu/drm/i915/selftests/i915_vma.c
> > +++ b/drivers/gpu/drm/i915/selftests/i915_vma.c
> > @@ -395,8 +395,8 @@ assert_rotated(struct drm_i915_gem_object *obj,
> >   	return sg;
> >   }
> >   
> > -static unsigned int rotated_size(const struct intel_rotation_plane_info *a,
> > -				 const struct intel_rotation_plane_info *b)
> > +static unsigned int rotated_size(const struct intel_remapped_plane_info *a,
> > +				 const struct intel_remapped_plane_info *b)
> >   {
> >   	return a->width * a->height + b->width * b->height;
> >   }
> > @@ -406,7 +406,7 @@ static int igt_vma_rotate(void *arg)
> >   	struct drm_i915_private *i915 = arg;
> >   	struct i915_address_space *vm = &i915->ggtt.vm;
> >   	struct drm_i915_gem_object *obj;
> > -	const struct intel_rotation_plane_info planes[] = {
> > +	const struct intel_remapped_plane_info planes[] = {
> 
> Why this?

Just a new name to better reflect the widened scope of the struct.

> 
> >   		{ .width = 1, .height = 1, .stride = 1 },
> >   		{ .width = 2, .height = 2, .stride = 2 },
> >   		{ .width = 4, .height = 4, .stride = 4 },
> > 
> 
> Regards,
> 
> Tvrtko

-- 
Ville Syrjälä
Intel
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